Express.js Tutorial: Build RESTful APIs with Node and Express | Mosh---ccf19881030

Express.js Tutorial: Build RESTful APIs with Node and Express | Mosh

在Youtube上看到Mosh的一篇关于使用Node和Express构建RESTful APIs的示例，对应的视频地址是：Express.js Tutorial: Build RESTful APIs with Node and Express | Mosh，作者Mosh的Youtube地址是：Programming with Mosh

TABLE OF CONTENT:

00:49 What are RESTful APIs 06:48 Introducing Express 09:09 Your First Web Server 14:57 Nodemon 16:29 Environment Variables 19:44 Route Parameters 25:22 Handling HTTP GET Requests 30:09 Handling HTTP POST Requests 33:53 Calling APIs using Postman 36:03 Input Validation 44:03 Handling HTTP PUT Requests 52:33 Handling HTTP DELETE Requests

http://programmingwithmosh.com

创建程序

首先保证在自己的系统下安装了Node.js程序，然后安装配置node和npm、cnpm等 然后使用cnpm或npm安装express和joi依赖，

cnpm install express joi

对应的代码如下：

const Joi = require('joi'); const express = require('express'); const app = express(); app.use(express.json()); // 课程列表数组 const courses =[ { id: 1, name: '语文' }, { id: 2, name: '数学' }, { id: 3, name: '英语' }, { id: 4, name: '计算机组成原理' }, { id: 5, name: '数据结构' }, { id: 6, name: '操作系统' }, { id: 7, name: '编译原理' } ] app.get('/', (req, res) => { res.send('Hello World'); }) // 获取所有的课程信息 app.get('/api/courses', (req, res) => { res.send(courses); }); // 提交一门课程 app.post('/api/courses', (req, res) => { const { error } = validateCourse(req.body); // result.error if (error) { return res.status(400).send(error.details[0].message); } // 在提交课程前，对课程名进行校验，若课程名为空或者小于3个字符，则返回 // if (!req.body.name || req.body.name.length < 3) { // // 400 Bad Request // res.status(400).send('Name is required and should be minimum 3 characters.'); // return; // } // 创建一个课程对象 const course = { id: courses.length + 1, name: req.body.name }; // 向课程列表数组中添加一个新项 courses.push(course); res.send(course); }); // 根据课程id查询某个课程 app.get('/api/courses/:id', (req, res) => { const course = courses.find(c => c.id === parseInt(req.params.id)); if (!course) { // 404 return res.status(404).send('The course with the given ID was not found!'); } res.send(course); }); // 根据课程id更新某门课程 app.put('/api/courses/:id', (req, res) => { // Look up the course // If not existing, return 404 const course = courses.find(c => c.id === parseInt(req.params.id)); if (!course) { // 404 return res.status(404).send('The course with the given ID was not found!'); } // Validate // If invalid, return 400 - Bad request const { error } = validateCourse(req.body); // result.error if (error) { return res.status(400).send(error.details[0].message); } // Update course // Return the updated course course.name = req.body.name; res.send(course); }); // 根据课程id删除某门课程 app.delete('/api/courses/:id', (req, res) => { // Look up the course // Not existing, return 404 const course = courses.find(c => c.id === parseInt(req.params.id)); if (!course) { // 404 return res.status(404).send('The course with the given ID was not found!'); } // Delete const index = courses.indexOf(course); courses.splice(index, 1); // Return the same course res.send(course); }) // app.get('/api/posts/:year/:month', (req, res) => { // res.send(req.params); // //res.send(req.query); // }); // app.post() // app.put() // app.delete() const port = process.env.PORT || 3000; app.listen(port, () => { console.log(`App Listening on port ${port}...`); }); function validateCourse(course) { const schema = { name: Joi.string().min(3).required() }; return Joi.validate(course, schema); }

关于http接口测试工具，可以使用Postman或者在VSCode中使用rest-client插件进行测试，或者使用curl工具进行测试。

不过需要注意的是，在npm官网上作者说joi包已经被废弃了，建议使用@hapi/joi

This package has been deprecated Author message:

This module has moved and is now available at @hapi/joi. Please update your dependencies as this version is no longer maintained an may contain bugs and security issues.

参考资料joihttps://hapi.dev/module/joi/@hapi/joijjoi-The most powerful data validation library for JS ---来自腾讯云社区的---ccf19881030